engleski

The effect of post-harvest technologies on selected metabolites in persimmon (Diospyros kaki Thunb.) fruit

BACKGROUND Tannins are frequently the main focus in the investigation of de‐astringency treatments of persimmon, and the effect of a controlled atmosphere on other phytochemicals is often overlooked. In this research, the changes in content of total soluble and insoluble phenolics, soluble tannins, saponins, carotenoids and changes in primary metabolites were monitored. RESULTS Generally, treatment with ethylene induces a decrease in total phenolic content, while in treatment with CO2, the content of total phenolics remains unchanged in comparison to the level of total phenolics before treatment. Treatment with apple‐sourced ethylene did not significantly affect the level of total phenolics. Additionally, for both varieties, ‘Kaki Tipo’ and ‘Rojo Brillante’, the share of insoluble phenolics strongly increased in the treatment with CO2, whereas in the treatment with ethylene, the same change applied for the ratio of soluble phenolics. The content of carotenoids strongly varied among treatments and varieties, while the content of total saponins remained unchanged, regardless of the treatment and variety. CONCLUSION The results show that the content of metabolites in persimmon was greatly and variously affected by used post‐harvest technology. Apart from the treatment used, changes in the content of metabolites are also greatly affected by the persimmon variety.

soluble phenolics ; insoluble phenolics ; tannins ; carotenoids ; saponins

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